U.S. Air Force, French air force and Royal air force fly in formation during ATLANTIC TRIDENT 17 near Joint Base Langley-Eustis, Va., April 26, 2017. The exercise simulated a highly-contested, degraded and operationally-limited environment where U.S. pilots, allied pilots and ground crews tested their readiness, enhanced interoperability through combined operations, to develop new tactics, techniques and procedures. (U.S. Air Force photo/Staff Sgt. Natasha Stannard)